11) Gigi consumes only Perrier and cheese. In order to maximize her happiness subject to l 1) limited income, Gigi should purchase the amounts of Perrier and cheese at which _ A) the addition to happiness of the last bottle of Perrier is the same as the addition to happiness of the last pound of cheese. B} the addition to happiness per dollar spent on Perrier is the same as the addition to happiness per dollar spent on cheese. C} she spends all her income. D} both E: and c E) both a and c